Legend:

It's not a dupe. It was explained to me by @nacin, that on the front users should only be able to create sites with a-Z0-9, whereas in the network admin, super admins should be able to use whatever characters they want.

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It's not a dupe. It was explained to me by Nacin, that on the front users should only be able to create sites with a-Z0-9, whereas in the network admin, super admins should be able to use whatever characters they want.